[pugs]

If they have PEEK gears, you won't gain much going to stainless gears. Peek is a super plastic (read expensive) with some amazing strength and heat properties.

If you can figure out a shaft drive motor, that is probably the weak point, the 80 psi is probably just under where the mag drive starts to slip. If the relief valve can't handle anything higher, then bottom it out and use an external one.